單項選擇題

In normal kidneys, which of the following is true of the osmolarity of renal tubular fluid that flows through the early distal tubule in the region of the macula densa?

A、Usually isotonic compared with plasma
B、Usually hypotonic compared with plasma
C、Usually hypertonic compared with plasma
D、Hypertonic, compared with plasma, in antidiuresis
E、none of above
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